Hammer Drills are only as good as the bits being used by them. That's why you need a Bosch Spline Drill Bit when using your hammer drill. Bosch Spline Drill Bits cut through the toughest materials with ease. Not mention, they come in a variety of sizes to suit your hammer drilling needs. These Spline Hammer Drill Bits are made of quality materials that are both durable and fast enough to make quick work of tough projects.